History of Sculpture Jam Sebastopol. Sonoma County Sculptors organized Sculpture Jam in 1998, to promote local sculptors and bring sculpture to the public. Teams of artists form each year, beginning in January. In October the community participates in the final building stages by coming out to the Lumber Yard in downtown Sebastopol, working, listening to music, seeing the show and actually participating in putting the sculptures together. The Jam is sponsored by Sebastopol Center for the Arts.